Random Questions on setup

 

Another question I left out yesterday not an issue but more of curiosity. while cutting I noticed one of the plates showing in red that it had been cut already and then it went back to white like it hadn't been cut yet. this is more than likely in the manual but thought I'd ask. Is this also part of cut recovery so as long as it is still red that's how far back you can go for cut recovery?

If something is already cut and it goes to cut it again, it has nothing to do with LinuxCNC, but everything to do with the CAM used as there are two layers of the same thing there.
Hard to spot as multiple paths/layers can not be seen in 2D.

it didn't cut it again; it just removed the red highlighted lines as it progressed through the G-code.

Went through and set Z axis, I'm guessing because it homes to the + its confusing the heck out of me. 
POS = 7.00
NEG = 0.00
Final Pos = .125
Home switch location = .125
Search Direction = POS
Home Latch = Opposite
This appears to work except when it homes it does its magic dance it sets the position to .317. OK.... go to do a probe test and it drops to around -.63 and says no no no your going below the limit. 
why isnt it setting the position to 6.875 

tommylight wrote:

Wrong ini settings for Z axis, home switch must be up, HOME must be 0, HOME_OFFSET must be something small so it backs of off the switch, 3-5mm is ok, max limit to 0 and min limit to -100 or -150 or whatever the Z axis can do.

In inches
POS = 0
NEG = -7
Final Pos = -.125 <<<<<< notice - in front of value
Home switch location = 0
The rest seems OK, so give it a try and report back.

HOME_OFFSET is the location of the home switch:
linuxcnc.org/docs/devel/html/config/ini-...ng.html#_home_offset

HOME is where the Z axis moves to at HOME_FINAL_VEL to complete homing, it is not a requirement that this is zero.
linuxcnc.org/docs/devel/html/config/ini-homing.html#_home

As an example my little metric table has a total Z axis motion of 75mm. The home switch is at the very top of Z motion. At the completion of homing my Z axis moves down 5mm from the top. My settings are: Note the MIN_LIMIT needs to be below the top of the slats. Mine is about 3mm below the slats.
Note also that I don't use the "preferred" method of having Z zero at the top, if I did then I would have something like: